Bancroft and Sams were both still in a Perth hospital on Saturday morning following their sickening clash in the field during the Thunder's last-ball win over the Scorchers.
The pair are awaiting the rest of CT scans, but Sams will also be sidelined for at least 12 days after he and Bancroft were diagnosed with concussions.
Both players will also spend at least another night in Western Australia, unable to fly to Brisbane with the rest of their teammates.
Bancroft has also been left to nurse a broken nose out of the incident, with a shadow now hanging over the rest of his domestic summer.
The horrors of the clash came as another remarkable story emerged, with Oliver Davies rushing from the hotel to act as a concussion sub.
Still feeling unwell, Davies scored three off eight balls but the Thunder went on to chase down Perth's 4-177 from the final ball of the match.
The win lifted the Thunder to second on the BBL ladder with a game in hand, after winning only one game all of last season.
But the club are likely to count the costs of Friday night for some time.
Bancroft's injury caps a horror summer for the West Australian, who began it in contention for a Test spot before his form dropped at the worst possible moment.
The Thunder will briefly get Sam Konstas back after the Sydney Test, but will likely enter the finals without he or Bancroft if Konstas is picked for the Sri Lanka tour.
The Thunder will be short-changed for at least four games with the injury to allrounder Sams (l). (Richard Wainwright/AAP PHOTOS)
Sams is also one of the Thunder's most important players given his strike with the ball and ability to hit hard late.
The allrounder will miss at least the next four games for the Thunder, with any return date to depend on how he recovers from his concussion.
For now the Thunder are at least confident he suffered no further serious injuries, after laying prone on the Optus Stadium turf and needing to be taken off in a medicab.
Play was stopped for five minutes following the collision, with Sams treated by medical staff and an ambulance crew on the field.
20°C